Major Key Signatures Handy Guide Theory Things   William Wieland
1. Memorize the order of sharps. ( FCGDAEB )
2. Memorize where they go. ( C sharp major )
3. ½ step above the last sharp (the next letter) is the key.
    (The last sharp is ti.)

Key Signatures is a good explanation from
Key Signature Identification set to major keys is a good drill from

Memorize: C — NO sharps or flats
F — 1 Flat
G — 1 sharp
F — 6 sharps
G — 6 flats